Fuel-pump for internal-combustion engines.



H. E. FENCHELLE. I FUEL PUMP FOR INTERNAL COMBUSTION ENGINES,

APPLIQATION FILED DEC. 6. 1917- Paterite'd Dec.17, 1918.

Tn-ventnr.

PATENT OFFICE.

HUGH EMILE FENCHELLE, OF GENOA, ITALY, ASSIGNOR TO WILLIAM L. KANN,

TRUSTEE, OF PITTSBURGH,

PENNSYLVANIA.

FUEL-PUMP FOR INTERNAL-COMBUSTION ENGINES.

To all whom it may concern Be it known that I, HUGH EMILE FEN- GHELLE, a British subject, residing at Via XX Settembre 34/4, Genoa, in the Kingdom of Italy, have invented certain new and useful Improvements in Fuel-Pumps for Internal-Combustion Engines, of which the following is a specification.

This invention relates to fuel pumps for internal combustion engines of the type employing ignition on D1esel lines, especially engines in which liquid fuel is in'ected mechanically as a spray without t e use of spraying air, the invention more particularly relating to the suction valve of the pumps and to improved means of controllin the said valve so as to vary the delivery of elbg the pump.

Accor ing to this invention the amount of fuel delivered is measured by the extent of movement of a reciprocating suction valve during the suction and compression strokes, which movement may be regulated by an adjustable stop.

referred the suction valve is made in the orm of a hollow piston with an internal non return valve and fuel assages leading from the supply channel, the reciprocating valve bein drawn into the pump chamber at the beginning of the suction stroke until the aforesaid stoprevents further movement, whereupon t e continued outward movement of the pump lunger draws fuel through the valve into the ump chamber. During the early part of the compression stroke of the pump the valve .is driven back to its original posltion, when the remainder of the stroke is used to deliver the fuel under pressure through the delivery valve to the spraying device. The amount of fuel delivered will 2f course vary inversely to the amount-of dle movement of the. pump plunger emitted b the backward movementof t e suction lston valve.

In order that the said invention may be clearly understood and rea ily carried into 1 efiect the same will be more fully described with reference to the accompanying draw- 0 ings, in which Figure 1 shows in vertical section a pump constructed in accordance'with the present invention, and

Fig. 2 is a detail view showing the valve st device.

a is-the pump body, B the plunger and C Specification of Letters Patent.

.In the construction Patented Dec. 17, 1918.

Application filed December 6, 1917. Serial No. 205,887. v

an eccentric by which the pump is driven. D is the suction valve and E the delivery valve of the pump. 5

F is a regulating shaft by means of which the movement of the suction valve D is determined through the aid of the stop rod 7.

The suction valve D, which is inclosed in thevalve casing d perforated at d and communicating with the fuel inlet channel a. in the pum valve d in the form of a ball normally lying against a seating in the hollow end (i of the valve stem d Atthe outer end of this stem is a head or collar d comprising a small plate or disk adapted to meet the end plate or stop f on the stop rod f. The other end of thls rod meets the flat face f of the regulating shaft F, part of which shaft is cut away to leave a semi-cylindrical portion. through the lever arm i and rod f connected to the engine governor or to any type d meets the stops plate" f. The further movement of the pistonvalve D being then stopped, the pump plunger begins to draw fuel through the passages a, d and the hollow piston valve D into the pump chamber a which is kept full of fuel; On beginning the delivery stroke of the pump the pressure on the 'fuel first drives back the piston valve D, the small internal ball valve d closing body A, contains a secondary- The regulating shaft is operated immediately the delivery stroke begins so as to prevent the fuel in the chamber a flowing back through the interior of the valve D. During a, portion of the delivery stroke, the

7 extent of which depends upon the previous inward movement of the valve D, the fuel is not subjected to appreciable pressure and only when the valve D closes against its seating can the delivery pressure be exerted on the fuel. For the rest of the deliver stroke the fuel is driven, under the high pressure desired for spra ing urposes, through the delivery valve and t e outlet e'to a fuel spraying device fitted in the engine cylinder.

The extent of movement allowed to the piston valve D depends upon the. position ofthe sto plate f and this is under the control 0 the regulating shaft F. The angular adjustment of the regulating member or shaft F determines the point at which quent decreases of the fresh fuel drawn through the valve into the pump chamber. The. valve D may when desired be entirely freed from stop controlby, for example, formin the stop (plate f with a notch f.

at one si e (Fig. 2 sothat when the stop rod f is turned to the freeing position the disk (2 on the valve stem 03* can pass the stop plate f and, if the pum plunger B continues to be driven, it simp y moves the suction valve D in and out without delivering any fuel. The pump delivery can therefore be cut off by, a simple rotation of the valve stop i The suction valve itself may be used as a small hand operated piston pump to fill the tubes and passages with oil and to expel the air before starting the engine and, as the valve can be completely controlled from outside during the working of the engine, it

may be turned to dislodge any impurities wh1ch may accumulate between the valve and its seat. vA. small conical seating in the casing d is preferably provided againstf which a conicallip on the end of the valve D closes when the valve is driven back.

What I claim and desire to secure by Letters Patent of the United States is 1. In a measuring pump, a reciprocating pump plunger, a suction valve controlling the mlet to the pump chamber and actuated by the suction and compression actions of said plunger, and means whereby said valve may follow the suction stroke of the plunger ldly for a predetermined portion of the suct1on stroke without admitting fluid therethrough -to the pump chamber.

2. In a measuring pump, a reciprocating plun er, a reciprocating suction valve actuated y said plunger of piston, form adapted 3. In a measuring pump,a pum chamher, a plunger therein, a reciprocating suction valve controlling the inlet to said chamber and actuated by the action .of the said plunger, said valve having a limited range aeaeeo of movement in the pump chamber, during which movement liquid neither enters nor leaves the said chamber, and means for regulating the range of such movement.

4.-In a measuring pump, a reciprocating plunger, a reciprocating suction valve of pistonform free to follow the movement of liquid at the beginning of the suction and delivery strokes of the plunger without passage of the liquid past the valve and an adjustable stop limiting the range of movement of the valve.

5. In a measuring pump, a pump chamber, a reciprocating plunger, a reciprocating hollow piston suction valve through which the fuel passes, the said valve being adapted to be drawn into the pump chamber without passage of the liquid during a portion of the suction stroke of the plunger, and an adjustable stop preventing further inward movement of the valve.

' 6. In a measuring pump, a hollow reciprocating piston suction valve, a secondary nonreturn valve situated in the said piston valve and means for regulating the range of movement of the said piston valve.

7. In a measuring pump, a reciprocating piston, a reciprocating suction valve of piston form adapted to follow the movement of the plunger through a predetermined portion of its stroke, an abutment member on the outer end of the said valve, an adjustable sliding stop adapted to meet the valve abutment and a re lating shaft the angular adjustment of which determines the position of the said stop.

'8. In a measuring pump, a reciprocating plunger. a reciprocating suction valve following up the movement of the plunger so as to render a portion of the stroke i le, means for regulating the range of movement of the said valve, and means for releasing the said valve from control so that it can follow up the plungerduring the entire stroke.

9. In a measuring pump, a reciprocating plunger, a reciprocating suction valve of piston form free to follow the movement of liquid at the beginning of the suction and delivery strokes of the plunger without passage of the liquid past the valve, an adjustable stop limiting the range of movement of the valve. and means for freeing'the valve from the said stop to allow the valve to fol low up the plunger movement through the entire stroke.

10. In w measuring pump, a reciprocatin plunger, a reciprocating suction valve 0 piston form free to follow the movement of I liquid at the beginning of the suction and delivery strokes of the plunger without pas sage of the liquid past the valve, an abutment member on the valve, and an adjustable stop plate adapted normally. to meet the said abutment at a predetermined point in the pump stroke and on turning through an angle to clear the said abutment so as to free the valve from control.

11. In a measuring pump, a reciprocating pump plunger, a reciprocating suction valve controlling the admission of fluid to the pump chamber and'actuated by the plunger, said valve being constructed and arranged to follow the movement of the pump plunger through a predetermined portion of its stroke, a stop member for limiting such movement, and means for adjusting the position of the stop. 1

12. In a measuring pump, a, reciprocating pump lplunger, a reciprocatin suction valve contro ling the admlssion o fluid to the pump chamber and actuated by the plunger said'valv'e being constructed and arranged to follow the movement of the pump plunger through a predetermined portion of its stroke, a stop member for limitin such movement, and means for adjusting t e position of the stop, said valve having an externally projecting handle. portion whereby the valve in be actuated to act as the piston of a han pump to deliver fluid into the pump chamber.

HUGH EMILE FENCHELLE. 

